JPH0231002Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for attaching the fixed frame and the mounting arm of the seat board in a fixed chair installed in a stadium or theater, etc., and its purpose is to The slight elasticity of the restoring spring holds the seat upright with a small opening angle relative to the backrest, and from this state the seat is rotated backwards (towards the backrest) and forward while applying the elasticity of the restoring spring. A mounting device for a fixed frame and a mounting arm for a seat plate, which is configured to be movable and can withstand long-term use by minimizing the load applied to the restoring spring when not in use and reducing the fatigue of the spring. Our goal is to provide the following.

Another purpose of this invention is to provide a fixed frame and seat that can be reliably attached to the top surface of the mounting arm to prevent distortion of the seat plate even if the fixed frame is installed on a floor board with a slightly different installation surface. An object of the present invention is to provide a mounting device for mounting a plate with a mounting arm.

This invention will be explained below based on the embodiment shown in the drawings. 1 is a fixed frame erected on the floor board at an interval suitable for interposing the seat plate, and a backrest is attached to the upper part of the fixed frame. An arm 2 and an armrest 3 projecting horizontally forward are integrally provided. Reference numeral 4 denotes a backrest mounted between the backrest mounting arms 2 of the pair of opposing fixed frames 1, 1, and 5 indicates a backrest mounted between mounting arms 6 provided on the fixed frame 1, as described later. It is a seat board. The fixed frame 1 and the mounting arm 6 are connected as shown below.

That is, an annular projection 7 is formed on the lower inner surface of the fixed frame 1, and a central protrusion 10 having a recess 9 for receiving a portion of the steel ball 8 is formed at the center of the annular projection 7, and a central projection 10 is formed on the lower outer peripheral surface. The protrusion 1 provided on the inner circumferential surface of the annular protrusion 7 is provided with anti-rotation protrusions 11 spaced apart from each other at a predetermined interval, and a hole 12 is bored at a position slightly offset from the central protrusion 10.
An abutment piece 15 made of an elastic material is attached between the protrusion 14 and the protrusion 14 provided on the central protrusion 10. The mounting arm 6 to which the seat plate 5 is attached includes a disc-shaped base 16 having a slightly smaller diameter than the annular projection 7, and an arm 17 extending from the base 16.
and a horizontal part 18 that extends over a part of the base 16 and the upper part of the arm, and is perpendicular to the base 16 and the arm 17, on which the seat plate 5 can be attached. At the center of the fixed frame 1 side, there is a recess 1 for receiving the other part of the steel ball 8 which is partially fitted into the recess 9 of the central protrusion 10.
9 is provided, further centering on the recess 19,
1 located outward from the outer circumferential surface of the central protrusion 10 and inward from the inner circumferential surface of the annular protrusion 7 and regulating the rotational range of the mounting arm 6 by contacting with the abutment piece 15; A pair of stoppers 20, 20, and an arcuate hole 2 facing the hole 12 provided in the fixed frame 1.
1 is provided protrudingly. On the opposite side of the base 16 from the fixed frame 1, there is a hemispherical protrusion 2 at the center thereof.
2, and an outward pressing piece 23 is provided on a portion of the periphery. Reference numeral 24 denotes a restoring spring, which has a larger diameter than the outer edge diameter of the arcuate hole 21 and is attached to the base 1 of the mounting arm 6.
It has a coil shape with a smaller diameter than 6, and both ends 24a,
24b extend outwardly at predetermined intervals.
Reference numeral 25 denotes a cover for the restoring spring 24, which has a central hole 26 on the periphery of the disk 27, which has a central hole 26 whose outer diameter is substantially the same as that of the base 16 and whose diameter is larger than the outer edge diameter of the arcuate hole 21. An inwardly directed rib 27' with a cutout is provided, and the base 16 is located at this cutout position.
A pressing piece 23 is interposed. Reference numeral 28 denotes a pressing piece, which has a central inner surface of the main portion 29 that can come into contact with the outer surface of the disk 27 of the cover 25 of the restoring spring, and a center penetrating the center hole 26 of the cover 25 of the restoring spring 24. It has a protrusion 30, and a hemispherical recess 31 that matches the hemispherical protrusion 22 is provided in a portion of the central protrusion 30 that faces the hemispherical protrusion 22 provided on the base 16 of the mounting arm 6, and Main part 2
At the lower end of 9, there is a mounting part 34 that is inwardly L-shaped and has a protrusion 33 at the tip of the horizontal part 32 that fits between the anti-rotation protrusions 11 provided on the outer peripheral surface of the annular protrusion 7. The horizontal portion 32 is held between both ends 24a and 24b of the restoring spring 24 so that the restoring spring 24 has a slight initial elasticity. Furthermore, the pressing piece 28 includes:
A hole 35 that matches the hole 12 of the fixed frame 1 is bored. 36 is hole 1 of fixed frame 1
2. Arc-shaped hole 21 of base 16, inside of restoring spring 24, center hole 26 of cover 25 of restoring spring 24
37 is a washer, and 38 is a nut screwed into the connecting bolt 36.

With the steel ball 8 fitted in the recess 9 provided in the central protrusion 10 of the annular protrusion 7 provided on the fixed frame 1, the mounting arm 6 is attached to its disk-shaped base 1.
A recess 19 provided at the center of the steel ball 8 receives the steel ball 8, and the stoppers 20, 20 are provided in a groove formed between the annular protrusion 7 and the central protrusion 10. Spring 24 at both ends 2
The pressing piece 23 provided on the base 16 of the mounting arm 6 is positioned between 4a and 24b, and covered with the cover 25 of the restoring spring, and the hemispherical projection 22 provided at the center of the base 16 is pressed. The center protrusion 30 of the piece 28 is inserted into the center hole 2 of the cover 25 of the restoring spring.
6 to match the hemispherical recess 31 provided in the central protrusion 30 and the hemispherical protrusion 22 of the base 16. At this time, the horizontal portion 32 of the mounting portion 34 of the pressing piece 28 is attached to both ends 24a, 2 of the restoring spring 24.
4b, and a rotation stop protrusion 1 provided with a protrusion 33 provided at the tip on the outer peripheral edge of the annular protrusion 7.
1, and then the hole 12 of the fixed frame 1, the arc-shaped hole 21 of the base 16 of the mounting arm 6,
After passing the connecting bolt 36 through the inside of the restoring spring 24, the cover 25 of the restoring spring 24, and the hole 35 of the pressing piece 28 from the fixed frame 1 side, insert the nut through the washer 37 on the pressing piece 28 side. Tighten at 38. The installed state when connected integrally in this way is as shown in FIG.
and the recess 19 on the mounting arm 6 side.

In the state shown in FIG. 8 in which they are integrally attached, the mounting arm 6 is pressed against one end of the restoring spring 24 by the weight of the seat plate 5 attached thereto, as shown in FIG. 24b, and the seat plate 5 is held at a required opening angle with the backrest 4, as shown by the solid line in FIG. Therefore, the restoring spring 24 can hold the mounting arm 6 in an upright state with a slight elasticity. From this state, when the mounting arm 6 is folded forward by sitting on the seat plate 5, the base 1 of the mounting arm 6
6 is supported by the steel ball 8 on one side and the hemispherical recess 31 of the pressing piece 28 on the other side, and rotates about the hemispherical recess 31 (FIG. 7). In this case, since the connecting bolt 36 is located within the arcuate hole 21 provided in the base 16 of the mounting arm 6, the mounting arm 6
With this rotation, the pressing piece 23 of the mounting arm 6 releases the restoring spring 24.
The one end portion 24b is moved counterclockwise in FIG. Therefore, the restoring spring 24 gradually applies a larger biasing force to the mounting arm 6 as the mounting arm 6 rotates. When the mounting arm 6 is in a horizontal state, one stopper 20 provided at the base 16 of the mounting arm 6 comes into contact with the abutment piece 15 to prevent its rotation, so that the seat plate 5 It is maintained in the state shown by the imaginary line A in Figure 1.
Next, when the user stands up from this state and releases the load on the seat plate 15, the mounting arm 6 rotates clockwise in FIG. The state will be restored. In addition, when the mounting arm 6 is rotated clockwise in FIG. 5 in the opposite direction to the above, for example, when the user stands up in that position and presses the seat plate 5 against the backrest 4 side with the calves of the lower legs, , contrary to the above, the other end 24a of the restoring spring 24 is moved clockwise by the pressing piece 23 of the base 16, and the one end 24b of the restoring spring 24 is moved clockwise by the pressing piece 23 of the pressing piece 28. By being in contact with the other side of the horizontal portion 32, the restoring spring 24 sequentially applies a large biasing force to the mounting arm 6 as the mounting arm 6 rotates, and the mounting arm 6 moves as shown in FIG. When the seat plate 5 is in a substantially vertical state as shown in FIG. In this case, it is effective to widen the passage formed between the front row and the back row, which are made up of consecutively arranged chairs. When the pressure on the seat plate 5 by the calf of the lower leg is released from this state, the mounting arm 6 is returned to the state shown in FIG. 5 by the restoring spring 24.

Furthermore, this invention has the mounting arm 6 as described above.
However, a recess 19 provided on one side of the center of the base 16
The steel ball 8 fitted therein is held between the recess 9 provided in the central protrusion 10 of the fixed frame 1, and the hemispherical protrusion 22 provided on the other side of the center of the base 16 is held in place by the pressing piece 28. Hemispherical recess 3 provided in the central protrusion 30
In the installed configuration consistent with 1.
The depths of the recess 19 of the base 16 and the recess 9 of the fixed frame 1 are made smaller than the radius of the steel ball 8,
The configuration is such that a predetermined gap l is provided between the end surface of the annular projection 7 and the side surface of the base 16 of the mounting arm 6. With this configuration, the mounting arm 6 can only move vertically relative to the fixed frame 1. This means that it can also rotate in the horizontal direction orthogonal to it.
That is, the mounting arm 6 is in a state where it can rotate along the spherical surface of the steel ball 8.

Therefore, if the fixed frames 1 are set up on the floor board with a suitable interval for the seat boards to be interposed, there will be some inclination or distortion on the floor surface, and the height of both fixed frames 1 from the floor board will be reduced. Even if there are some differences,
Since the mounting arms 6 attached to each fixed frame 1 can rotate horizontally with respect to the fixed frame 1, the mounting arms 6 can be mounted on the horizontal portions 18 of both mounting arms 6 without applying unreasonable distortion force to the seat plate 5. This allows the bottom of the board to be securely attached.

This idea is structured as described above, so
When the seat plate is not in use and is held at the required opening angle with the backrest, the restoring spring only needs to have an extremely weak elasticity necessary to absorb the load of the seat plate itself. Since the initial elasticity of the restoring spring is small, it is extremely rational to use the restoring spring in the case of fixed chairs installed in stadiums, theaters, etc. where a large proportion of seats are left unused.
It is possible to prevent deterioration of the springs and has excellent durability, and the seat plate can be tilted not only from the prone position to the seated state but also from the non-use state to the backrest side. This has the advantage of allowing users to widen the aisle formed between the front row and the back row by standing up from their seats, making it easier for users to pass through the aisle. .

Furthermore, in this invention, the mounting arm itself is configured to be able to rotate in the horizontal direction perpendicular to the fixed frame, so even if the installation surface on which the fixed frame is installed is slightly distorted, the seat plate will not be unduly distorted. This has the advantage that the seat plate can be reliably mounted on the pair of mounting arms without causing any damage.

[Brief explanation of the drawing]

The drawings show an embodiment; Fig. 1 is an overall perspective view of a chair with a seat plate attached using the mounting device according to this invention, Fig. 2 is an exploded perspective view of this invention, and Figs. 3 and 4 are one-dimensional views. 5 to 7 are partial views showing the operating state, and FIG. 8 is a longitudinal sectional view of the main parts. In the figure, 1 is a fixed frame, 4 is a backrest, 5 is a seat plate, 6 is a mounting arm, 7 is an annular projection, 8 is a steel ball,
9 and 19 are recesses, 11 is a rotation stopper projection, 15 is a contact piece, 16 is a base, 20 is a stopper, 22 is a hemispherical projection, 23 is a pressing piece, 24 is a restoring spring, 2
8 is a pressing piece, 31 is a hemispherical recess, 32 is a horizontal portion, and 33 is a protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) A side surface of an annular protrusion, a central protrusion located at the center of the annular protrusion and having a concave portion on the end surface, and a gap between the inner surface of the annular protrusion and the outer surface of the central protrusion. a fixed frame including a contact piece fixed to a portion thereof and a pair of anti-rotation protrusions protruding from a portion of the outer periphery of the annular protrusion, and a backrest; A recessed portion for holding the steel ball between the recessed portion and a stopper that is interposed within the annular projection and abuts against the abutment piece to restrict the rotation range; A mounting arm for mounting a seat plate having a hemispherical protrusion provided at a position corresponding to the recess and a pressing piece bent at a part of the periphery on the side surface, and a mounting arm having a coil shape with both ends thereof a restoring spring extending outward so that the pressing piece is positioned therebetween, and a hemispherical recess that is inserted through the restoring spring and fitted with the hemispherical protrusion of the mounting arm, and A horizontal part extending inward provided on a part of the outer periphery is held by both ends of the restoring spring, and a pressing piece is provided at the tip of the horizontal part extending between the rotation stopper projections of the fixed frame. the mounting arm and the restoring member so that a required gap is maintained between the annular protrusion of the fixed frame and one side of the mounting arm through the steel ball between the fixed arm and the pressing piece. A fixing device for a chair, characterized in that a spring is interposed between the fixing arm and the pressing piece, and the mounting arm is connected to the fixing arm and the pressing piece so that they can rotate along the circumferential surface of the steel ball. A mounting device between the frame and the seat plate mounting arm. (2) A device for attaching a fixed frame and a seat plate attachment arm in a chair according to claim 1, wherein the abutment piece is made of an elastic material.